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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.

Free practice: Conti SystemScore 0/0
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On the table, the ringed ball is your ball (1).
Conti System
Aim = Start − Arrival
Your ball:White(cue ball · 1)
Other balls:YellowRed
Expected shot:Conti SystemBricole (cushion first)Cushion orderLong → Short → Long

The cue ball goes to the cushions before touching any ball; after the cushions in order it hits the balls.

Given:
Start50Arrival20
In this position, what is Aim?

Task: put the given values into the system's formula and calculate Aim. Enter the answer as the number read on the table's Aim scale.